How do you reset the computer?
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Junior User
Joined: Feb 2007
Posts: 85
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From: Eastern Washington
How do you reset the computer?
I've read a couple of posts where people did some repairs and reset the computer upon completion. What does this actually do for your truck? How would you go about doing it.
As long as I'm tearing into my engine anyway, might as well replace the various input sensors for speed density and reset the computer!
'95 F150, 351, E4OD, 4x4
As long as I'm tearing into my engine anyway, might as well replace the various input sensors for speed density and reset the computer!
'95 F150, 351, E4OD, 4x4
Posting Guru
Joined: Jan 2006
Posts: 1,263
Likes: 1
From: The dark carnival
Originally Posted by S_Bruce
I've read a couple of posts where people did some repairs and reset the computer upon completion. What does this actually do for your truck? How would you go about doing it.
As long as I'm tearing into my engine anyway, might as well replace the various input sensors for speed density and reset the computer!
'95 F150, 351, E4OD, 4x4
As long as I'm tearing into my engine anyway, might as well replace the various input sensors for speed density and reset the computer!
'95 F150, 351, E4OD, 4x4
This erases all the memory in the computor and forces it to relearn what is "normal" for all of it's various inputs and what not. Since not all sensors are created equal, it is a good idea to do this when replacing sensors.
Posting Guru
Joined: Apr 2005
Posts: 2,246
Likes: 2
From: Hawkeye Country
Just thought I'd add when the computer is disconnected the engine will need to relearn its idle. After reconnecting the battery start the truck and let it idle for a minute, it may idle a little shaky at first but it will sort its self out.
If you were to just hop in the truck and drive off it would take a little while for it to relearn its idle again.
If you were to just hop in the truck and drive off it would take a little while for it to relearn its idle again.
Fleet Mechanic
Joined: Feb 2004
Posts: 1,448
Likes: 2
From: CA Central Coast
Another reason for knowing how to do this:
My truck occasionally has the check engine light come on, and throws a code for the EGR. CA emissions test will fail me automatically if it reads the stored code.
Twice in the last 4 years before getting tested, I disconnect the battery and clear the codes, and she passes no problem. This last time, the CEL came on again on the way home from the test.
I suppose one of these days I oughtta get under the hood for real...
My truck occasionally has the check engine light come on, and throws a code for the EGR. CA emissions test will fail me automatically if it reads the stored code.
Twice in the last 4 years before getting tested, I disconnect the battery and clear the codes, and she passes no problem. This last time, the CEL came on again on the way home from the test.
I suppose one of these days I oughtta get under the hood for real...
Elder User
Joined: May 2007
Posts: 754
Likes: 1
From: Solon, Ohio
The best way I've found to erase the memory codes is to pull the jumper in the middle of the tests. This immediately halts the test and resets the constant memory to 1-1-1 again. You don't have to wait 30 minutes that way.
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Posting Guru
Joined: Jan 2006
Posts: 1,263
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From: The dark carnival
Originally Posted by netscaner
The best way I've found to erase the memory codes is to pull the jumper in the middle of the tests. This immediately halts the test and resets the constant memory to 1-1-1 again. You don't have to wait 30 minutes that way.
Originally Posted by shooter05
you can clear the codes by just reading them. you don't have to disconnect the battery.
Last edited by eco; May 17, 2007 at 08:51 PM.
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Mountain Pass
Joined: Aug 2005
Posts: 211
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From: Newark, Ohio
Originally Posted by e1p1
Another reason for knowing how to do this:
My truck occasionally has the check engine light come on, and throws a code for the EGR. CA emissions test will fail me automatically if it reads the stored code.
Twice in the last 4 years before getting tested, I disconnect the battery and clear the codes, and she passes no problem. This last time, the CEL came on again on the way home from the test.
I suppose one of these days I oughtta get under the hood for real...
My truck occasionally has the check engine light come on, and throws a code for the EGR. CA emissions test will fail me automatically if it reads the stored code.
Twice in the last 4 years before getting tested, I disconnect the battery and clear the codes, and she passes no problem. This last time, the CEL came on again on the way home from the test.
I suppose one of these days I oughtta get under the hood for real...
Post Fiend
Joined: Mar 2002
Posts: 19,402
Likes: 38
From: Bonita Springs FL
Just two things to add - there is virtually nothing to gain by replacing SD sensors just because you're in there. If they're good, they're good. Given the quality of some aftermarket parts, you are better off leaving a working sensor in place.
Secondly, reading the codes from an OBD-I computer doesn't reset them. Whoever posted that is thinking of OBD-II.
Secondly, reading the codes from an OBD-I computer doesn't reset them. Whoever posted that is thinking of OBD-II.
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